sometimes they do this. they dont have you wear both at once. it may be that they are making it so you can choose which one you want to wear or they may be planing on having you alternate it. top at night and bottom during the day or vice versa. Make sure that you talk about this with them so you know the reasoning.

Also, how much did this cost on average for most people? Mine is just over $2000, is that normal??

yes that is normal